Which of the following phenomena is illustrated by the inheritance of flower colour in dog flower?

Options

A. Co-dominance
B. Recombination
C. Incomplete dominance
D. Linkage

Answer

To solve the question regarding the inheritance of flower color in dog flower (snapdragon), we will analyze the different inheritance patterns and identify which one applies to this specific case.

### Step-by-Step Solution:

1. **Identify the Flower Colors**:
- In dog flowers (snapdragons), there are two flower colors: red and white.
- Red is the dominant trait, while white is the recessive trait.

**Hint**: Look for the traits being studied and their dominance relationships.

2. **Cross the Two Flower Colors**:
- When a red flower (RR) is crossed with a white flower (rr), the resulting offspring (Rr) exhibit an intermediate phenotype, which is pink.

**Hint**: Consider what happens when you cross the dominant and recessive traits.

3. **Analyze the Offspring Phenotype**:
- The pink flowers (Rr) are neither red nor white but represent a blend of both colors, indicating that the traits do not completely mask each other.

**Hint**: Look for the characteristics of the offspring and how they relate to the parent traits.

4. **Determine the Inheritance Pattern**:
- This blending of traits is characteristic of incomplete dominance, where the heterozygous condition results in a phenotype that is intermediate between the two homozygous conditions.

**Hint**: Recall the definition of incomplete dominance and how it differs from complete dominance and co-dominance.

5. **Conclusion**:
- Therefore, the phenomenon illustrated by the inheritance of flower color in dog flowers (snapdragons) is incomplete dominance.

**Hint**: Summarize the findings to confirm the answer.

### Final Answer:
The correct answer is **incomplete dominance**.